Experiments on the nutrition of the dairy heifer: V. Nutrition in late pregnancy

Broster, W. H.; Tuck, Valerie J.; Balch, C. C.

doi:10.1017/s0021859600015045

Cited by 18 publications

(17 citation statements)

References 9 publications

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“…The earlier demonstrations Broster et al , 1964Broster et al , 1965Broster et al , 1969 of the benefit to live-weight gain from additional energy in the ration at constant N intake has been confirmed here and extended to N retention. A ranking order amongst the carbohydrate supplements in promoting growth was not clear in the evidence on either measure of growth, though the mean growth rate promoted by supplemented rations was significantly greater than that supported by unsupplemented rations.…”

Section: Effect Of Energy Supply On N Utilization: Sugars As Supplementssupporting

confidence: 82%

Experiments on the nutrition of the dairy heifer. XI. Further observations on the effect of energy intake on protein utilization

Broster¹,

Smith²,

Siviter³

et al. 1978

J. Agric. Sci.

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Five experiments were made to observe the effect on nitrogen (N) utilization by young cattle of supplements of sucrose, glucose monohydrate (dextrose), and maize starch when added to basal diets of concentrates and straw. The supplements provided about 12 % of the total intake of air-dry food. Twenty-four yearling Friesian heifers were used in each of two randomized block experiments to measure live-weight gain, and 6, 10 and 10 yearling Friesian steers in three changeover design experiments to measure N retention.Rates of live-weight gain and N retention were increased by all the supplements amongst which no order of superiority in benefit conferred could be established. The improvement in N retention was associated with a marked reduction in urinary N and a small increase in faecal N with supplemented rations.The proportions of volatile fatty acids (VFA) in rumen fluid were not affected by starch supplementation. Both sugars, but glucose more than sucrose, decreased the ratio of acetic to propionic acid, measured 2 h after feeding.Statistically significant multiple linear regression equations were observed between N retained and intakes of N and digestible organic matter (DOM), both as absolute amounts with live weight as a further independent variate, and as intakes/unit metabolic body size. N 2 and DOM x N as additional variates did not benefit the fit of the equations over the range of intakes studied.reference to the type of fermentation produced in the rumen, linking with the parallel studies made Considerable attention has been focused in here with lactating cows (Broster et al. 1970). recent years on the control of N utilization in ruminants exercised by the energy supply (Balch,

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Section: Effect Of Energy Supply On N Utilization: Sugars As Supplementssupporting

confidence: 82%

Experiments on the nutrition of the dairy heifer. XI. Further observations on the effect of energy intake on protein utilization

Broster¹,

Smith²,

Siviter³

et al. 1978

J. Agric. Sci.

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“…Comparison with the work of others is difficult because of differences in sampling techniques. For example, the reports of Broster, Tuck & Balch (1963) and Wilkinson & Prescott (1970) do not give details of the height of sampling but their results and comments suggest that it was not at ground level. The indication from their trials that at least 40 g/kg LW is required by young weaned cattle to avoid depressions in intake is probably an underestimate.…”

Section: The Influence Of Herbage Allowance Upon Herbage Intakementioning

confidence: 99%

Milk-fed calves:4. The effect of herbage allowance and milk intake upon herbage intake and performance of grazing calves

Baker

Barker

1978

J. Agric. Sci.

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The effect of herbage allowance and milk intake upon herbage intake and performance was investigated using 48 Hereford x Friesian calves purchased at 10-12 days of age and reared on reconstituted milk substitute. Groups of 24 calves were fed low (L) or high (H) daily quantities of milk normally associated with 240-day lactation yields of 1000 or 2000 kg. Six calves on each milk treatment were allocated to four daily herbage allowances during the grazing season. These were 20, 40, 60 or 80 g/kg herbage dry matter/kg live weight.There was no effect of herbage allowance before day 95; thereafter both herbage intake and live-weight gain of the L20 and H20 groups were depressed. The effect was greatest for the L calves. Additional milk consumption reduced herbage intake at all herbage allowances. Milk intake influenced the extent to which calves were buffered from the effects of a low herbage allowance.

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“…Animals in good condition at calving have a greater reserve upon which to draw in lactation, particularly in the event of small rations after calving (Broster et al 1958). This is supported by the negative relationships observed between milk yield and change of liveweight after calving (Johannson, 1954;Mason et al 1957;Broster, 1962).…”

mentioning

confidence: 97%

“…The heifers were weighed on the 2nd and 3rd day after calving, and the mean of these weights used as the initial liveweight. All the heifers were included in feeding trials in early lactation (Bailey, Broster, Brown & Foot, 1954;Broster, Ridler & Foot, 1958;Broster, Tuck & Balch, 1964). Animals were allocated to blocks according to date of calving and liveweight.…”

mentioning

confidence: 99%

“…Significant differences at the 5 % level of probability were established between individual group regressions. Of the 6 bull groups, the progeny of bull E had been used in an experiment by Broster et al (1964) in which a fixed ration was given to each heifer regardless of its milk yield, in contrast with other heifers in the present study whose rations varied according to the amount of milk produced. All the heifers on the fixed ration experiment, including the daughters of bull E, showed a negative correlation between initial liveweight and milk yield (Broster, 1962); this was considered a sound reason for regarding them as distinct from the other 5 groups of half-sibs and they were accordingly withdrawn from the analysis.…”

mentioning

confidence: 99%

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The influence of liveweight at calving on milk production in Friesian heifers

Ridler¹,

Broster²,

Westgarth³

1965

Journal of Dairy Research

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SummaryRecords of 81 heifers, daughters of 6 bulls, were examined to determine the regressions of milk yield, corrected for lactation length, on initial liveweight and age at calving.Age was found to have no significant effect and was discarded in the final analysis.The regression equations were similar for the different groups of half-sibs, except for one group whose members had not been fed according to milk yield. After removal of this group, a highly significant positive relationship between lactation yield and liveweight at calving was found ‘within bull groups’. The mean values of groups of halfsibs did not show this relationship, and significant differences in milk yield still persisted between groups after adjustment for liveweight differences.It was concluded that herd improvement by choosing heifers solely on the basis of liveweight shortly after calving appears unlikely to be effective unless the sire's potential is known and the feeding during lactation takes into account the greater maintenance requirements of heavier animals.

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Experiments on the nutrition of the dairy heifer: V. Nutrition in late pregnancy

Cited by 18 publications

References 9 publications

Experiments on the nutrition of the dairy heifer. XI. Further observations on the effect of energy intake on protein utilization

Experiments on the nutrition of the dairy heifer. XI. Further observations on the effect of energy intake on protein utilization

Milk-fed calves:4. The effect of herbage allowance and milk intake upon herbage intake and performance of grazing calves

The influence of liveweight at calving on milk production in Friesian heifers

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